Independent component analysis of cycle resolved combustion images from a spark ignition optical engine

Bizon, Katarzyna; Continillo, Gaetano; Lombardi, Simone; Sementa, Paolo; Vaglieco, Bianca Maria

doi:10.1016/j.combustflame.2015.10.002

Cited by 20 publications

(17 citation statements)

References 30 publications

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“…Other authors have applied POD to combustion processes, be it through CFD simulations [185], or experimentally obtaining the flow snapshots with the aid of optical techniques such as PIV [186][187][188][189], chemiluminiscence [190] or raw luminosity [191], but most of these results are restricted to continuous combustion cases such as those of gas turbines or industrial Although some authors have specifically addressed ICE combustion issues through POD, these studies have been focused on cycle-to-cycle variation analysis [191][192][193], spark-ignition misfires [194] or the evolution of a particular species [195], whereas the pressure resonance issues of CI combustion chambers addressed in this work has not been yet investigated using this method.…”

Section: Proper Orthogonal Decompositionmentioning

confidence: 99%

Computational assessment of combustion noise of automotive compression-ignited engines

Soriano¹

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derstanding the unsteady pressure field inside combustion chambers of compression ignition engines using a CFD approach". International J of Engine Research (available on-line), 2018. I would like to record my sincere gratitude to my advisor Prof. Alberto Broatch for his guidance and support during the chase of this research. A gratitude that also must be extended to Prof. Payri and Prof. Desantes on behalf of CMT-Motores Térmicos and Universitat Politècnica de València for offering me the chance to become part of this research group during these four years. I owe my most special thanks to Prof. Ricardo Novella for his advice and invaluable help in the most difficult moments but especially for the good ones we shared during the fruitless lunchtime discussions, sports sessions... I just can say, moltes gràcies per tot Rick.

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Section: Proper Orthogonal Decompositionmentioning

confidence: 99%

Computational assessment of combustion noise of automotive compression-ignited engines

Soriano¹

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“…An asymmetric spray can be discerned after 3.5CAD ASOI. This is due to the irregular mechanical lift of the needle in the first instants of the injection process [34] or the differences of the nozzle geometry. The asymmetric spray eventually leads to the asymmetric spray flame, which will be described in the subsequent sections.…”

Section: Morphology Analysismentioning

confidence: 99%

HVO, RME, and Diesel Fuel Combustion in an Optically Accessible Compression Ignition Engine

et al. 2019

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The current paper investigates the spray and combustion characteristics of Hydrotreated Vegetable Oil (HVO), petrol diesel (EN590), blends of HVO with petrol diesel (70% EN590 and 30% HVO) and Rapeseed oil Methyl Esters (RME) in an optically accessible compression ignition engine. Mie scattering and natural luminosity imaging are employed to measure the liquid spray and combustion behaviors. The spray and combustion processes are divided into four stages based on optical imaging. The morphology and quantitative analysis based on imaging provides a method for visualizing the incylinder spray and combustion behavior with four test fuels. The ignition delay and combustion characteristics detected from optical measurements are compared to those determined from cylinder pressure. The results show that the ignition delay of HVO and RME occurs earlier and the flame propagation at the premixed combustion stage proceeds faster compared to EN590 and HVO30. The spray and combustion characteristics of HVO30 are similar to EN590. However, ignition occurs earlier for HVO30 due to the higher CN. Comparison of the HVO and RME shows that there is a marginal difference in the ignition delay for these two fuels. However, the combustion duration of RME is shorter than that of HVO.

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“…Although some authors have specifically addressed ICE combustion issues through POD, these studies have been focused on cycle-to-cycle variation analysis [36,37,38], sparkignition misfires [39] or the evolution of a particular species [40], whereas the pressure resonance issues of CI combustion chambers addressed in this work has not been yet investigated using this method.…”

Section: Proper Orthogonal Decompositionmentioning

confidence: 99%

Modal decomposition of the unsteady flow field in compression-ignited combustion chambers

Torregrosa

Broatch

García-Tíscar

et al. 2018

Combustion and Flame

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In this paper, the unsteady behaviour of a compression-ignited (CI) engine combustion chamber is studied by analyzing the results of a Computational Fluid Dynamics (CFD) model through the application of different flow decomposition techniques, aiming to resolve the underlying modal structure of the process. Experimental validation for the combustion simulation is provided, and a methodology for extracting coherent pressure information is proposed in order to provide a suitable input for different analysis methods. These range from straightforward Fourier transform techniques to more sophisticated modal decomposition approaches. In particular Proper Orthogonal Decomposition (POD) is shown to provide valuable insight into the time-spatial structure of the combustion flow field, allowing the establishment of correlations between pressure modes and physical parameters of the combustion, such as the injection timing or the chamber geometry. Dynamic Mode Decomposition (DMD) on the other hand is proven to successfully highlight the link between the frequency of the unsteady energy components and their spatial distribution within the chamber. Advantage is then taken of the modal characterization of the unsteady behaviour in the chamber to showcase how physical parameters such as the spray angle can be modified to optimize the acoustic signature of the combustion process, helping CI internal combustion engines reduce their acoustic environmental impact.

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Independent component analysis of cycle resolved combustion images from a spark ignition optical engine

Cited by 20 publications

References 30 publications

Computational assessment of combustion noise of automotive compression-ignited engines

Computational assessment of combustion noise of automotive compression-ignited engines

HVO, RME, and Diesel Fuel Combustion in an Optically Accessible Compression Ignition Engine

Modal decomposition of the unsteady flow field in compression-ignited combustion chambers

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